GUIDELINES
FOR
MARINE
LIFTING
&
LOWERING
OPERATIONS
0027/ND Rev 11
Page 84 of 84
Hence, the derivation of loads is as follows;
For Crane #1, total load to lift point 1 = [(14+0.8)*sin3] + [(13+0.9)*cos3] * (9+0.6) * W = 0.2794 * W
[25*cos3 + (14-10)*sin 3]
20
For Crane #1, total load to lift point 4 = [(14+0.8)*sin3] + [(13+0.9)*cos3] * (11+0.6) * W = 0.3376 * W
[25*cos3 + (14-10)*sin 3]
20
For Crane #2, total load to lift point 2 = [(10+0.8)*sin3] + [(12+0.9)*cos3] * (9+0.6) * W = 0.2607 * W
[25*cos3] - [(14-10)*sin3]
20
For Crane #2, total load to lift point 3 = [(10+0.8)*sin3] + [(12+0.9)*cos3] * (11+0.6) * W = 0.3150 * W
[25*cos3] - [(14-10)*sin3]
20
In order to account for the yaw of the structure, the loads to the lift points need to be increased by a
yaw factor, see Section 5.4.7. Assuming that the sling angles are small on the hooks and that there is
no significant
wind or tugger line loads, a yaw factor of 1.05 is to be applied.
Hence,
to account for yaw, the vertical loads at the lift points are:
For Crane #1, total load to lift point 1 = 0.2794 * W * 1.05
=
0.2934 * W
For Crane #1, total load to lift point 4 = 0.3376 * W * 1.05
=
0.3545 * W
For Crane #2, total load to lift point 2 = 0.2607 * W * 1.05
=
0.2737 * W
For Crane #2, total load to lift point 3 = 0.3150 * W * 1.05
=
0.3307 * W
These loads are to be used in the design of the rigging with the weight used to be in accordance with
Section 5.2.
11
